If you do that, you should use the same source's transistor for the other side, Complementary Pair and not the original. So find the BD 437's complementary PNP and order it up as well, for the other side.

Therefore the actual power output of any amplifier is limited by whatever amount of power its power supply can deliver. In this case, that would be the combined power of the two DC rails, minus the Efficiency factor of the amplifier design type. Amplifier design type (or class) is what the power dissipation spec brings to the subject. Bear in mind that this figure is NOT the same as "power output capability" -- it refers to how much power, in heat, that the device can safely dissipate without destroying itself.

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